Royal Caribbean International is debuting $115 million of new features in Navigator of the Seas, a cruise ship making its year-round home at PortMiami. The ship has added The Blaster, the longest aqua coaster at sea; Riptide, the industry’s only head-first mat racer waterslide; a reimagined poolscape infused with Caribbean vibes; the first standalone blow-dry bar at sea; and improved dining and nightlife. The ship is sailing in the Caribbean through May and then switching to shorter trips to the Bahamas.